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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0134
         Cisco Webex Teams Shared File Manipulation Vulnerability
                              14 January 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Webex Teams
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
                   Reduced Security               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-1242  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-teams-7ZMcXG99

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Webex Teams Shared File Manipulation Vulnerability

Priority:        Medium
Advisory ID:     cisco-sa-webex-teams-7ZMcXG99
First Published: 2021 January 13 16:00 GMT
Version 1.0:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvv74842
CVE Names:       CVE-2021-1242
CWEs:            CWE-450

Summary

  o A vulnerability in Cisco Webex Teams could allow an unauthenticated, remote
    attacker to manipulate file names within the messaging interface.

    The vulnerability exists because the affected software mishandles character
    rendering. An attacker could exploit this vulnerability by sharing a file
    within the application interface. A successful exploit could allow the
    attacker to modify how the shared file name displays within the interface,
    which could allow the attacker to conduct phishing or spoofing attacks.

    Cisco has released software updates that address this vulnerability. There
    are no workarounds that address this vulnerability.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-teams-7ZMcXG99

Affected Products

  o Vulnerable Products

    At the time of publication, this vulnerability affected Cisco Webex Teams
    releases earlier than Release 40.12.0.17293.

    See the Details section in the bug ID(s) at the top of this advisory for
    the most complete and current information.

    Products Confirmed Not Vulnerable

    Only products listed in the Vulnerable Products section of this advisory
    are known to be affected by this vulnerability.

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

  o When considering software upgrades , customers are advised to regularly
    consult the advisories for Cisco products, which are available from the
    Cisco Security Advisories page , to determine exposure and a complete
    upgrade solution.

    In all cases, customers should ensure that the devices to be upgraded
    contain sufficient memory and confirm that current hardware and software
    configurations will continue to be supported properly by the new release.
    If the information is not clear, customers are advised to contact the Cisco
    Technical Assistance Center (TAC) or their contracted maintenance
    providers.

    Fixed Releases

    At the time of publication, Cisco Webex Teams releases 40.12.0.17293 and
    later contained the fix for this vulnerability.

    See the Details section in the bug ID(s) at the top of this advisory for
    the most complete and current information.

Exploitation and Public Announcements

  o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
    any public announcements or malicious use of the vulnerability that is
    described in this advisory.

Source

  o Cisco would like to thank Hou JingYi of Qihoo 360 CERT for reporting this
    vulnerability.

Cisco Security Vulnerability Policy

  o To learn about Cisco security vulnerability disclosure policies and
    publications, see the Security Vulnerability Policy . This document also
    contains instructions for obtaining fixed software and receiving security
    vulnerability information from Cisco.

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-teams-7ZMcXG99

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    +----------+---------------------------+----------+--------+--------------+
    | 1.0      | Initial public release.   | -        | Final  | 2021-JAN-13  |
    +----------+---------------------------+----------+--------+--------------+

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